1 files changed, 10 insertions, 0 deletions
diff --git a/aoc-2020-gleam/src/ext/boolx.gleam b/aoc-2020-gleam/src/ext/boolx.gleam
new file mode 100644
index 0000000..f3c8b49
--- /dev/null
+++ b/aoc-2020-gleam/src/ext/boolx.gleam
@@ -0,0 +1,10 @@
+pub fn guard_lazy(
+  when requirement: Bool,
+  return consequence: fn() -> t,
+  otherwise alternative: fn() -> t,
+) -> t {
+  case requirement {
+    True -> consequence()
+    False -> alternative()
+  }
+}